THEBAUD, Augustine J. (tay-bo), clergyman, born in Brittany in 1807; died in Fordham, New York, 17 December, 1885. He studied for the priesthood, and after his ordination was for several years engaged in missionary work in Brittany. He afterward went to Rome and entered the Society of Jesus. In 1838 he came to the United States and was appointed professor in St. Mary's college, Kentucky, where he remained until that institution passed from the control of the Jesuits in 1845. He then taught physics and mathematics in St. John's college, Fordham, of which he was president in 1846-'52. He was then made pastor of St. Joseph's church, Troy, where he began his investigations in Irish history. He was afterward transferred to New York, where he continued the same line of research, the result of which was the publication of " The Irish Race," a work that placed him in the first rank as a philosophic historian, and of which Dr. Orestes A. Brownson wrote that it had caused him to change life-long opinions on questions of paramount importance in the philosophy of history. Father Thebaud went to Canada, where he remained a year, and then returned to New York. The rest of his life was spent in missionary labors and literary pursuits. He was a frequent contributor to Roman Catholic periodicals. Besides the work already mentioned he published "Gentilism" ; "The Church and the Moral World" ; and " Twit-Twatso."